instanceOop.hpp revision 113
0N/A/*
0N/A * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
0N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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0N/A */
0N/A
0N/A// An instanceOop is an instance of a Java Class
0N/A// Evaluating "new HashTable()" will create an instanceOop.
0N/A
0N/Aclass instanceOopDesc : public oopDesc {
0N/A public:
113N/A // aligned header size.
0N/A static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; }
113N/A
113N/A // If compressed, the offset of the fields of the instance may not be aligned.
113N/A static int base_offset_in_bytes() {
113N/A return UseCompressedOops ?
113N/A klass_gap_offset_in_bytes() :
113N/A sizeof(instanceOopDesc);
113N/A }
113N/A
113N/A static bool contains_field_offset(int offset, int nonstatic_field_size) {
113N/A int base_in_bytes = base_offset_in_bytes();
113N/A if (UseCompressedOops) {
113N/A return (offset >= base_in_bytes &&
113N/A // field can be embedded in header, or is after header.
113N/A (offset < (int)sizeof(instanceOopDesc) ||
113N/A (offset-(int)sizeof(instanceOopDesc))/wordSize < nonstatic_field_size));
113N/A } else {
113N/A return (offset >= base_in_bytes &&
113N/A (offset-base_in_bytes)/wordSize < nonstatic_field_size);
113N/A }
113N/A }
0N/A};